Physics
The splitting of different colours of light in a prism is :

Refraction of light
Diffraction of light
Reflection of light
Disperson of light

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the least surface area for a given volume
Inter molecular forces are weak in liquids
Intermolecular forces are strong in liquids
A sphere has the largest surface area for a given volume

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